Voldivh/model command output update

[Voldivh]

🦟 Bug fix

Fixes gazebosim/gazebo_test_cases#324

Summary

Checklist

• Signed all commits for DCO
• Added tests
• Updated documentation (as needed)
• Updated migration guide (as needed)
• Consider updating Python bindings (if the library has them)
• codecheck passed (See contributing)
• All tests passed (See test coverage)
• While waiting for a review on your PR, please help review another open pull request to support the maintainers

Note to maintainers: Remember to use Squash-Merge and edit the commit message to match the pull request summary while retaining Signed-off-by messages.

[ahcorde]

sign the commit https://github.com/gazebosim/gz-sim/pull/2138/checks?check_run_id=16723688786

[codecov]

Codecov Report

Merging #2138 (f580cd1) into gz-sim8 (4135cd1) will increase coverage by 0.01%.
Report is 2 commits behind head on gz-sim8.
The diff coverage is n/a.

❗ Current head f580cd1 differs from pull request most recent head 02c0a56. Consider uploading reports for the commit 02c0a56 to get more accurate results

@@             Coverage Diff             @@
##           gz-sim8    #2138      +/-   ##
===========================================
+ Coverage    65.45%   65.47%   +0.01%     
===========================================
  Files          323      323              
  Lines        30704    30704              
===========================================
+ Hits         20096    20102       +6     
+ Misses       10608    10602       -6     

see 1 file with indirect coverage changes